Scoop: Coming Up on THE BIG BANG THEORY on CBS - Thursday, December 28, 2017

On the episode "The Cognition Regeneration" - Leonard isn't thrilled when Penny considers taking a new job offered by her ex-boyfriend, Zack (Brian Thomas Smith), on a rebroadcast of THE BIG BANG THEORY, Thursday, Dec. 28 (9:01-9:31 PM, ET/PT), on the CBS Television Network. (Originally broadcast 4/27/17.)

Leonard and Sheldon are brilliant physicists - geniuses in the laboratory but socially challenged everywhere else.

Enter beautiful, street-smart neighbor Penny, who aims to teach them a thing or two about life. Despite their on-again, off-again relationship in the past, Leonard and Penny have finally gotten married.

Even Sheldon has found a female companion, entering into a "relationship agreement" with neurobiologist Amy Farrah Fowler, and he recently took their relationship to the next level by proposing marriage.

In their free time, Leonard and Sheldon enjoy fantasy role-playing games with their ever-expanding universe of friends, including fellow scientists Koothrappali, Wolowitz and Wolowitz's adorable microbiologist wife, Bernadette, who is adjusting to life with their new baby girl.